CN116425194A - Normal-temperature preparation process of bismuth sulfate solution - Google Patents

Abstract

The invention provides a process for preparing a bismuth sulfate solution at normal temperature, and relates to the technical field of inorganic chemistry. In the invention, the bismuth oxide is first ground to a specific particle size, and then added to the dilute sulfuric acid by sieving, thereby realizing the normal temperature preparation of the bismuth sulfate. Bi ³⁺ in the bismuth sulfate solution prepared by the invention is evenly dispersed, has good performance, has the advantages of energy saving and environmental protection, safety and convenience, time saving and high efficiency, and is suitable for large-scale industrial production.

Description

A kind of normal temperature preparation technology of bismuth sulfate solution

technical field

The invention relates to the technical field of inorganic chemistry, in particular to a process for preparing a bismuth sulfate solution at normal temperature.

Background technique

Lead-acid battery (VRLA) is a battery whose electrodes are mainly made of lead and Pb ₂ O ₃ and whose electrolyte is sulfuric acid solution. When the lead-acid battery is charged, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; after discharging, the main component of the positive and negative electrodes is lead sulfate. The nominal voltage of a single-cell lead-acid battery is 2.0V, which can be discharged to 1.5V and charged to 2.4V; in applications, six single-cell lead-acid batteries are often connected in series to form a nominal 12V lead-acid battery , There are 24V, 36V, 48V and so on. Lead-acid batteries are widely used in important fields such as automobiles, electric power, communications, and national defense because of their low cost, stable electrical performance, mature technology, safety and reliability, etc., but their use is limited due to their low specific energy.

In order to increase the ratio of the battery and improve the performance of the battery, it is generally chosen to add Bi ₂ O ₃ to the electrode active material to improve the utilization rate of the positive electrode active material. The addition of Bi ₂ O ₃ can increase the utilization rate of positive active material by 3-5%. The general preparation process is to dissolve Bi ₂ O ₃ in dilute sulfuric acid, and then add it to the electrode active material to improve its dispersion uniformity. However, due to the influence of _{Bi2O3 's} own characteristics, dilute sulfuric acid needs to be heated above 100°C to slowly dissolve _Bi2O3 , resulting in a long dissolution process, high energy consumption, low efficiency, and high risk, making it unable to adapt to large _- scale Industrial production.

Contents of the invention

In order to solve the above problems, the present invention provides a normal-temperature preparation process of bismuth sulfate solution. The method realizes the normal-temperature preparation of bismuth sulfate by grinding bismuth sulfate and adopting a specific dissolution process.

The normal temperature preparation technique of bismuth sulfate solution of the present invention comprises the following steps:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder;

(2) Add the bismuth oxide powder into dilute sulfuric acid by sieving, and stir until fully dissolved to obtain a bismuth sulfate solution.

Further, the particle size of the bismuth oxide powder in the step (1) is ≤70 μm.

Further, the dissolution temperature in the step (2) is 10°C to 35°C.

Further, the dissolution temperature in the step (2) is 10°C.

Further, the dissolution temperature in the step (2) is 25°C.

Further, the dissolution temperature in the step (2) is 35°C.

Further, the dissolving process in step (2) is carried out under stirring.

Further, the stirring speed in the step (2) is 200-350 r/min.

Further, the stirring speed in the step (2) is 250r/min.

Further, the step (2) is to place the bismuth oxide powder on a 200-mesh sieve, and add it to the dilute sulfuric acid by sieving.

The present invention also provides an application of using the above method to improve the utilization rate of the electrode active material of the lead-acid battery.

Compared with prior art, beneficial technical effect of the present invention:

Bi ³⁺ in the bismuth sulfate solution prepared by the invention is uniformly dispersed, has good performance, can be reacted at normal temperature, has the advantages of energy saving, environmental protection, safety, convenience, time saving and high efficiency, and is suitable for large-scale industrial production.

Detailed ways

The invention provides a kind of normal temperature preparation technology of bismuth sulfate solution, specifically comprises the following steps:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder;

(2) Add the bismuth oxide powder into dilute sulfuric acid by sieving, and stir until fully dissolved to obtain a bismuth sulfate solution.

In one embodiment, the particle size of the bismuth oxide powder in the step (1) is ≤70 μm.

In one embodiment, the melting temperature in the step (2) is 10°C to 35°C

In one embodiment, the dissolution temperature in the step (2) is 10°C.

In one embodiment, the dissolution temperature in step (2) is 25°C.

In one embodiment, the dissolution temperature in the step (2) is 35°C.

In one embodiment, the dissolving process in step (2) is carried out under stirring.

In one embodiment, the stirring speed in the step (2) is 200-350 r/min.

In one embodiment, the stirring speed in the step (2) is 250r/min.

In one embodiment, the step (2) is to place the bismuth oxide powder on a 200-mesh sieve, and add it to dilute sulfuric acid by sieving.

The present invention also provides an application of using the above method to improve the utilization rate of the electrode active material of the lead-acid battery.

The technical solution provided by the present invention will be further described below in conjunction with the examples.

Example 1

A normal temperature preparation process of bismuth sulfate solution, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with a particle size≤70 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with a density d ₂₅ =1.400g/ ^cm3 at 10°C, and stir continuously under the condition of 200r/min until the bismuth oxide powder After fully dissolving, a bismuth sulfate solution is obtained.

Example 2

A normal temperature preparation process of bismuth sulfate solution, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with a particle size≤70 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with density d ₂₅ =1.400g/ ^cm3 at 25°C, and stir continuously under the condition of 200r/min until the bismuth oxide powder After fully dissolving, a bismuth sulfate solution is obtained.

Example 3

A normal temperature preparation process of bismuth sulfate solution, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with a particle size≤70 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with a density of d ₂₅ =1.400g/ ^cm3 at 35°C, and stir continuously under the condition of 200r/min until the bismuth oxide powder After fully dissolving, a bismuth sulfate solution is obtained.

Example 4

A normal temperature preparation process of bismuth sulfate solution, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with a particle size≤70 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with density d ₂₅ =1.400g/ ^cm3 at 20°C, and stir continuously under the condition of 350r/min until the bismuth oxide powder After fully dissolving, a bismuth sulfate solution is obtained.

Example 5

A normal temperature preparation process of bismuth sulfate solution, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with a particle size≤70 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with density d ₂₅ =1.400g/ ^cm3 at 25°C, and stir continuously under the condition of 350r/min until the bismuth oxide powder is fully After dissolving, bismuth sulfate solution is obtained.

Comparative example 1

A preparation process for bismuth sulfate, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with an average particle size of 50 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with a density of d ₂₅ =1.400g/cm ³ at 25°C, stir continuously under the condition of 350r/min, and finally observe The bismuth oxide powder was not completely dissolved.

Comparative example 2

A preparation process for bismuth sulfate, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with an average particle size of 50 μm;

(2) Put 50g of bismuth oxide powder on a 200-mesh sieve, sieve it into 6500mL of dilute sulfuric acid with a density of d ₂₅ =1.400g/ ^cm3 at 120°C, stir continuously at 350r/min, and finally observe the oxidation Bismuth powder is completely dissolved.

Comparative example 3

A preparation process for bismuth sulfate, the steps are as follows:

(1) After fully grinding bismuth oxide, sieve to obtain bismuth oxide powder with an average particle size of ≤70 μm;

(2) Add 50 g of bismuth oxide powder directly into 6500 mL of dilute sulfuric acid with a density of d ₂₅ =1.400 g/cm ³ at 25° C. and keep stirring at 350 r/min. Finally, it was observed that the bismuth oxide powder was not completely dissolved.

In this paper, specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; meanwhile, for those of ordinary skill in the art, according to the present invention Thoughts, there will be changes in specific implementation methods and application ranges. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (10)

1. The normal temperature preparation process of bismuth sulfate solution is characterized by comprising the following steps:

(1) Fully grinding bismuth oxide, and sieving to obtain bismuth oxide powder;

(2) And adding the bismuth oxide powder into dilute sulfuric acid in a screening mode, and stirring until the bismuth oxide powder is fully dissolved to obtain bismuth sulfate solution.

2. The process for preparing a bismuth sulfate solution at normal temperature according to claim 1, wherein the particle size of the bismuth oxide powder in the step (1) is not more than 70. Mu.m.

3. The process for preparing a bismuth sulfate solution at normal temperature according to claim 1, wherein the dissolution temperature in the step (2) is 10 ℃ to 35 ℃.

4. A process for preparing a bismuth sulfate solution at normal temperature as claimed in claim 3, wherein the dissolution temperature in the step (2) is 10 ℃.

5. A process for preparing a bismuth sulfate solution at room temperature as claimed in claim 3, wherein the dissolution temperature in the step (2) is 25 ℃.

6. A process for preparing a bismuth sulfate solution at normal temperature as claimed in claim 3, wherein the dissolution temperature in the step (2) is 35 ℃.

7. The process for preparing a bismuth sulfate solution at normal temperature according to claim 1, wherein the dissolving process in the step (2) is performed in a stirring state.

8. The process for preparing a bismuth sulfate solution at normal temperature according to claim 7, wherein the stirring rotation speed in the step (2) is 200-350 r/min.

9. The process for preparing a bismuth sulfate solution at normal temperature according to claim 7, wherein the stirring rotation speed in the step (2) is 250r/min.

10. The process for preparing a bismuth sulfate solution at room temperature according to claim 1, wherein the step (2) is to put the bismuth oxide powder on a 200 mesh screen and add it to dilute sulfuric acid by sieving.